When you are thinking about building a new AR-15 pistol CMMG's Pistol Receiver Extension Kit is what you need to keep that lower receiver pistol compliant. CMMG has created the perfect kit containing an AR-15 pistol receiver extension, ambidextrous sling end plate, carbine buffer and spring. This kit is designed to work correctly with both .300 AAC blackout and 5.56mm NATO AR pistol builds.
